Re: [stella] VDEL...

Hi Eckhard!
>>Now, could that work, or would that
>>display rubbish every other line?
>I fear it won't work :-)
Hey! :-)
>>VDEL must be the most useless thing ever put inside a
>>chip... :-)
>It won't work. The random data would eventually get
copied
>into the GRP registers that are used for display, so it
would
>show up in every other scanline.
Too bad...
>And VDEL is quite useful, if you want to do simple
games
>like Combat, which is what the VCS was designed for.
Uhm... there is something done in Combat with VDEL you
can't do quicker & shorter without?!?
>Also
>it enables us to do the six digit score routine, which
is
>one of the most useful things for just about any VCS
game. ;-)
Again uhm... ;-)
Set aside all loads, what would prevent you from doing
STA GRP0
STA GRP1
...
STA GRP0
STX GRP1
STY GRP0
TSX
STX GRP1
without VDEL?!?
Actually, if done without VDEL, you save bytes & cycles
both in- and outside the kernel...
- Just imagine what cool stuff could've been done if
VDEL would delay any GRPX write exactly until the next
line!
Greetings,
Manuel
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